linux-kernel - [PATCH v2] scripts/checkpatch: check for uses of trace

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Date:	Wed,  8 Apr 2015 09:53:48 +0100
From:	Juri Lelli <juri.lelli@....com>
To:	joe@...ches.com
Cc:	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@....com>,
	Andy Whitcroft <apw@...onical.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Juri Lelli <juri.lelli@...il.com>
Subject: [PATCH v2] scripts/checkpatch: check for uses of trace_printk

Production kernels will scream if trace_printk() is used (thanks to
Steve's banner). Rather than waiting for that to happen, let's check
patches beforehand.

Signed-off-by: Juri Lelli <juri.lelli@....com>
Cc: Andy Whitcroft <apw@...onical.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Juri Lelli <juri.lelli@...il.com>
Cc: linux-kernel@...r.kernel.org
---
Changes since v1:

 o added an exception when the code is in kernel/trace/, as suggested
   by Steve and Joe;

 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d124359..c36b2b7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3257,6 +3257,13 @@ sub process {
 			     "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
 		}
 
+# check for uses of trace_printk
+		if ($realfile !~ m@...nel/trace/@ &&
+		    $line =~ /\btrace_printk\s*\(/) {
+			ERROR("TRACE_PRINTK",
+			      "Never use trace_printk in production code!\n" . $herecurr);
+		}
+
 # printk should use KERN_* levels.  Note that follow on printk's on the
 # same line do not need a level, so we use the current block context
 # to try and find and validate the current printk.  In summary the current
-- 
2.3.0

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